Improvement in refining ifton and steel



" FAEENT n wag ALEXANDER H. SIEGFRIED, OF SOUTH BEND, INDIANA, ASSlGNURTO HIMSELF AND GEGRGE l B; GAEMAN.

EMPRQVEMENT lN REFlNlNG l'RON AND STEEL,

Specification forming pert of Letters Patent No.- hhth fig, dated April11, 1871.

' 1'0 all whom it may cancer-n:

Be it known that I, ALEXANDER H. SIEG- FRIED, of the city of South Bend,in the county V and I do hereby declare that the following is a full andexact description of my mode and of the materials used by me.

I first heat the steel to echerry'red in an ordinary clear-smiths fire,then withdraw from the fire, and immediately cover the steel with purechloride of sodium, (common salt-,) and" cleanse the fire by throwingupon it a, portion of the same salt, and. again return the steel to thefire and raise it to e cherry-red heat; then withdraw the steel from thefire and cover it with a compound composed of twelve (12) parts ofchloride of sodium, pure, and one (1) part each of pure sulphate ofcopper, selenimoniae and. sel-soilc, togetherwith one-half part of purenit-rate of potassa, all by weight. The above proportions may beslightly varied without materially altering or modifying the result; butthe use of the above-mentioned chemicals, and in substantially theproportions above given, has been found by me to produce the bestresults. I then again return the steel to the fire and heat tccherry-red, as before, and. theu'withdrnw it from. the tire and refineby hammering upon the anvil, and agsinreturn it-to the fire and miss itto the same {legree of heat, as before; then Withdraw it from the fire,and again cover the steel with said compound above described, and againreturn the steel to the fire an in heat to e, cherry-red, as before, andthen alulrew it from the fire end plunge it eton nto at bath composed ofrain-Water, one n nitrate of potesse, pure, one-half ours zintl'one-helfounce; sel-sode, one nice; selemmoniaqone-h if ounce; and chloride ofsodium, six ounces; and. iii-substantially the same proportions when agreater or lesser quan tity of this solution is required.

lhe said chemicals. should. be of the purest quality possible te obtain,and it "OiIlBillUlBS necessary to purify the chloride 11:; edrinrn byboiling.

What I claim as my invention, in; secure by Letters Patent,- is

The within-described process s tempering a-mlrefining steel by the useof the beforementioned compounds of chemicals, in the menneres setforth.

ALEXANDER H. SIiFliEl-FRiEDQ Witnesses A. S. DUNBAR, Geo. H. ALWARD.

i'l desire to slum, one

